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Trial Shots Or Volleys

Military Handbooks: The Plattsburg Manual Advanced Training

If the ground is so dry and dusty that the fall of the bullets is

visible through a glass or with the naked eye, a method of determining

the distance is afforded by using a number of trial shots or volleys.

The method of using trial volleys is as follows: The sights are raised

for the estimated range and one volley is fired. If this appears to hit

but little short of the mark, an increase of elevation of 100 yards will

be used for the next volley. When the object is enclosed between two

volleys, a mean of the elevation will be adopted as the correct range.

The range may be obtained from a near-by battery or machine gun. This is

the best method when available.--Small Arms Firing Manual.